Though every color has its own imporatnace in any design or any artwork becuase some time you don't feel good to see a RED on some particular ground and some where the same RED looks so beautyful so more or less it depends on what ground or on what occassion you are using your colors but there is always a fvourite color of every individual and mine is BLUE
In order of most favorite to least-
1. Green (Every shade)
4. Black (technically even though it's not a colour due to lack of light reflected, it's still considered as one)
Every other colour takes up 6. :P
Blue! It is relaxing, it's beautiful. It's the color of the sky and the ocean. It is very comforting. And I'm told that blue makes people more productive which is a good reason to have blue in your environment.
PINK! It's bright and happy! If you combine it with a dark color, it brightens it up, and I believe it does the same for people. If your life is dark and sad, a little of the color pink should make you happy ^u^